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Steel Making

Annealing
ANNEALING can be done by heating to temperatures ranging from...

Hardening
Steel is hardened by quenching from above the upper critical....

Separating The Work From The Compound
During the pulling of the heat, the pots are dumped upon a ca...

Annealing Of Rifle Components At Springfield Armory
In general, all forgings of the components of the arms manufa...

Heavy Forging Practice
In heavy forging practice where the metal is being worked at...

Application To The Automotive Industry
The information given on the various parts of the Liberty eng...

Steel For Chisels And Punches
The highest grades of carbon or tempering steels are to be re...

Plant For Forging Rifle Barrels
The forging of rifle barrels in large quantities and heat-tre...

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

Crankshaft
The crankshaft was the most highly stressed part of the entir...

Effects Of Proper Annealing
Proper annealing of low-carbon steels causes a complete solu...

Effect Of Different Carburizing Material
[Illustrations: FIGS. 33 to 37.] Each of these different p...

Gas Consumption For Carburizing
Although the advantages offered by the gas-fired furnace for ...

Heat Treatment Of Axles
Parts of this general type should be heat-treated to show the...

Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...

Manganese
Manganese adds considerably to the tensile strength of steel,...

Tool Or Crucible Steel
Crucible steel can be annealed either in muffled furnace or b...

For Milling Cutters And Formed Tools
FORGING.--Forge as before.--ANNEALING.--Place the steel in a ...

Placing Of Pyrometers
When installing a pyrometer, care should be taken that it re...

Hardening Operation
Hardening a gear is accomplished as follows: The gear is tak...



An Automatic Temperature Control Pyrometer






Category: PYROMETRY AND PYROMETERS

Automatic temperature control instruments are similar to the Brown
indicating high resistance pyrometer with the exception that the
pointer is depressed at intervals of every 10 sec. upon contact-making
devices. No current passes through the pointer which simply depresses
the upper contact device tipped with platinum, which in turn comes
in contact with the lower contact device, platinum-tipped, and the
circuit is completed through these two contacts. The current is very
small, about 1/10 amp., as it is only necessary to operate the relay
which in turn operates the switch or valve. A small motor is used to
depress the pointer at regular intervals. The contact-making device
is adjustable throughout the scale range of the instrument, and an
index pointer indicates the point on the instrument at which the
temperature is being controlled. The space between the two contacts
on the high and low side, separated by insulating material, is
equivalent to 1 per cent of the scale range. A control of temperature
is therefore possible within 1 per cent of the total scale range.
Figure 131 shows this attached to a small furnace.





Next: Pyrometers For Molten Metal

Previous: Brown Automatic Signaling Pyrometer



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